High-energy neutrino event IceCube-260217A detected with moderate astrophysical origin probability.

AI Summary

The IceCube Neutrino Observatory detected a high-energy neutrino event with a moderate probability of being of astrophysical origin. Follow-up searches by ZTF/GROWTH and Fermi-LAT did not identify any associated transient or gamma-ray emission.

Notices (1)

IceCube — NEUTRINO · Tue, 17 Feb 2026 05:55:24 GMT

GCN Circulars (4)

GCN-43911 — IceCube-260217A · Tue, 03 Mar 2026 18:33:37 GMT
The Zwicky Transient Facility (ZTF) and Global Relay of Observatories Watching Transients Happen (GROWTH) collaborations reported no detection of candidate counterparts to the neutrino event IceCube-260217A using the Palomar 48-inch telescope and ZTF camera. The team observed the reported localization region, covering 100.0% of it with 30s exposures and a typical depth of 20.5 mag.

GCN-43788 — IceCube-260217A · Fri, 20 Feb 2026 22:37:41 GMT
The IceCube Neutrino Observatory reported no detection of additional neutrino events from IceCube-260217A within a 1000-second and 2-day time window, excluding the initial alert event. The sensitivity to neutrino point sources with an E^-2.5 spectrum was measured at 0.14 and 0.16 GeV cm^-2, respectively.

GCN-43781 — IceCube-260217A · Wed, 18 Feb 2026 21:17:41 GMT
Astronomers using the Fermi-LAT telescope reported no significant gamma-ray emission from the vicinity of the high-energy neutrino event IC260217A, detected by IceCube in 2017. They searched for intermediate timescale emission but found no excess above a 5σ threshold. The upper limits on the flux for different integration times were provided.

GCN-43768 — IceCube-260217A · Tue, 17 Feb 2026 11:46:06 GMT
The IceCube Neutrino Observatory at the South Pole detected a high-energy neutrino candidate track-like event on February 26, 2017. The event, IceCube-260217A, was initially selected by the ICECUBE_Astrotrack_BRONZE alert stream with a moderate probability of astrophysical origin and an estimated false alarm rate of 2.768 events per year. After further analysis, the direction of the event was refined to RA: 75.89 (+0.52/-0.56 deg), Dec: 14.63 (+0.45/-0.43 deg). No known gamma-ray sources were found within the uncertainty region. The event data, including the probability distribution for extracting precise containment regions, is available via Kafka.